Don't have the ST but on our zinger our favorite 2 featuresare probably the pack n play door/area and the flip around entertainment area (so you can flip TV from living area to bedroom). It is a greatfamily trailer overall for us.
We just purchased the 27RKX 5er and we love so many things about it. Ours came with the Intellejack system for connecting and disconnecting. That's cool. But, I really like the looks of the cabinets. Looks high end without the high end price tag.
I agree that "Sold" is a good feature. I also like the title that shows I own it and don't share it with the bank anymore. As for our Zinger, our favorite feature is the back door on the rear of the unit. The best ever for kids going in and out of the kids room.